I have a Drupal 7 site.

I have it working fine on localhost and my own test domain, with individual settings folders setup such as:

sites/localhost sites/test.mydomain.co.uk

I am now putting it up onto a site where there is no domain set, but I can access it by visiting: sitename.org/folder1/folder2

i have duplicate settings files in; sites/folder1.folder2 sites/www.upcomingfinaldomainname.com

Have I got these right?

I keep getting the message:

PDOException: SQLSTATE[HY000] [2013] Lost connection to MySQL server at 'reading initial communication packet', system error: 111 in db_table_exists()

I'm using the user and pass I have been provided, and the correct db names. I have also set host as localhost and removed the port number.

Any suggestions?

  • Does the MySQL server work well for other sites?
    – mpdonadio
    Commented Jul 23, 2013 at 20:41
  • Yes, no problems. Commented Jul 23, 2013 at 22:18
  • I think you need to enable PDO Extension, ask the hosting provider to enable it
    – Bala
    Commented Jul 24, 2013 at 5:06

2 Answers 2


If your connection parameters were incorrect, you would get a different error from MySQL.

I have seen connection problems on Drupal systems for a few different reasons.

  • Overloaded server
  • Low timeout values on a busy server
  • Low value for max_allowed_packet (this normally is a 2006 or 2020, though, in my experience).

Assuming other sites work, then the first two likely aren't the problem. I would check your max_allowed_packet and see if that helps matters. I typically use 32M; large values can help with restoring backups.


Looks like a database hosts misconfiguration. Check out the /etc/hosts.allow and set mysqld: ALL. Also, check if it's blacklisted in /etc/hosts.deny.

Also, check if the database server port and host are set correctly. If running on the same server, they should be and port is 3306 (default).

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